It depends what you mean when you say "the end of the world". Do you mean the end as we know it or do you mean the total destruction of the planet. To me that would be the true meaning of the end. Should it happen due to a very large impact that reduces the planet to dust or being ripped apart by the slowly expanding sun, that would be the true "end of the world".
A large impact would trigger massive quakes, how much would depend on how large the object is. It has happened before many times, we are already on our 3rd or 5th atmosphere due to massive impacts. There is not too much you can do about such things as that.
With our ever growing population, a shortage of food, the breakdown of the "system" as we know it, to me this is more realistic as to our lifetimes. Even so, nature has a way, sometimes cruel, about sorting everything out. So the "world" would still go on even if we are no longer calling the shots.
I try not to worry about such things that are out of my control but try to strive to live as best I can.
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